SquirrelMail is a web-based email client written in PHP, designed to provide a simple and efficient interface for managing emails directly from a web browser. It supports both IMAP and SMTP protocols, ensuring compatibility with a wide range of email servers. By rendering pages in pure HTML 4.0 without requiring JavaScript, SquirrelMail offers maximum compatibility across various browsers. Its lightweight design and minimal requirements make it easy to install and configure, catering to users seeking a straightforward webmail solution. Key Features and Functionality: - Email Management: Compose, send, receive, and organize emails with support for attachments and folder manipulation. - Address Book: Maintain and manage contacts for efficient communication. - MIME Support: Handle multimedia emails with robust Multipurpose Internet Mail Extensions support. - Plugin Architecture: Extend functionality with over 200 available plugins, including spell-checking, calendars, and advanced search capabilities. - Internationalization: Available in over 50 languages, accommodating a diverse user base. - Security: Supports secure authentication methods and can connect to IMAP servers via SSL for enhanced security. Primary Value and User Solutions: SquirrelMail addresses the need for accessible and reliable email management through a web interface, allowing users to access their emails from any location with internet connectivity. Its simplicity and compatibility make it an ideal choice for individuals and organizations seeking a no-frills, efficient webmail client. The extensive plugin system enables customization to meet specific user requirements, enhancing productivity and user experience. Additionally, as an open-source project licensed under the GNU General Public License , SquirrelMail offers a cost-effective solution without licensing fees.